Parameter Type; Conversion Index; Change During Operation - Danfoss VLT AutomationDrive FC 360 Programming Manual

Programming Guide | VLT® AutomationDrive FC 360
Option
[0]
[1]
[3]
1-82 Min Speed for Function at Stop [Hz]
Default value:
0.0 Hz
Setup:
All setups
Data type:
Uint16
Set the output frequency at which to activate parameter 1-80 Function at Stop.
1-88 AC Brake Gain
Default value:
1.4
Setup:
All setups
74
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Name
Coast
DC hold/Motor Preheat
Pre-magnetizing

Parameter type:

Conversion index:

Change during operation:

Parameter type:
Conversion index:
Description
Leaves the motor in free mode.
Energizes the motor with a DC hold
current (see parameter 2-00 DC Hold/
Motor Preheat Current).
Builds up a magnetic field while the
motor is stopped. This allows the motor
to produce torque quickly at commands
(asynchronous motors only). This
premagnetizing function does not help
the first start command. Two different
solutions are available to premagnetize
the machine for the first start command:
Solution 1:
1 Start the drive with a 0 RPM reference.
2 Wait 2 to 4 rotor time constants (see the
formula below) before increasing the
speed reference.
Solution 2:
1 Set parameter 1-71 Start Delay to the
premagnetize time (2–4 rotor time
constants).
2 Set parameter 1-72 Start Function to [0]
DC hold.
3 Set the DC-hold current magnitude
(parameter 2-00 DC Hold/Motor Preheat
Current to be equal to I
pre-mag
(1.73 x Xh)).
Sample rotor time constants=(Xh+X2)/
(6.3*Freq_nom*Rr)
1 kW=0.2 s
10 kW=0.5 s
100 kW=1.7 s
Range (0.0–500.0 Hz)
-1
True
Range (1.0–2.0)
-1
AU275649936274en-001401 / 130R0507
=U /
nom